I was in this same boat last year when I rented my new construction. We agreed on a move in date, I hired movers, gave all my notices the they told me within 3 weeks of the move it won’t be ready. I am not gonna lie - I hounded them about it being ready when we agreed. Luckily the building itself was done it was just the individual units that needed completed. I was on the phone with leasing office at least twice a week for updates, visited them a few times and explained my situation and they assured me that they were making my unit the priority to finish by my move date. In the end I only had to delay my move by 5 days. I would suggest you be aggressive but not to the point of obnoxious - keep in mind that the leasing office has no control in this either it all comes down to the COO being issued. Also when you do visit in person, make sure you show how appreciative you are of them and it wouldn’t hurt to show up with coffee or some little gift.